Filter for vacuum brushes



Oct. 19 1926. 1,603,674

; P. A. FISKER FILTER FOR VACUUM BRUSHES Filed August 1925 merges.

I Application"filed nug'ust 4; 1925-,- serialm.

This. invention rel ates to a afiltergfor yacu uin bru'sh'es' of that kind in.,whicl1 'the ressen tially bag-shaped filter extendsinto; the. dusts. container, the dustbeing I filtrated; from the;

uir'by-the outer'surfaceofthe'filteia; Until now the filters for? this kindgof; vacuum bru'she'shave the -drawback.thattthey i cannot be eilectively cleansed without; be-g in removed from the 'dust containen-v ln evitablya gre'at portionofthe dust adheringto the filter will'beraised at the'cleansingf of the filter, whether tl iswcleansing. "is can; riedout by sha-kingbeating, or brushing the latter.-

r :1 1;. This drawback is doneaway I with by the present invention, "according to which; the filter may 'be-turned inside out. Thus iteis obtained that the" filter :may be i turned when in connection with the dust containera sov that the side normallyturningoutward and upon which the dust sits, will be turned inward. By this turningthe filter may be thoroughly cleansed ,-the dust beingishaken into the dust: container without-being"ralised' into the air;

In the drawing someconstructional forms v of the invention ar'e 'rep'res'ented; r Fig. 1 is a partialsecti'onalrelev ation of a vacuum-brush with a filteriaccording. to the invention. 13s,, Fig. .2 shows this filter as seen from the bottom,

Figs. 3, 4 and 5 show another constructional form of the filter, Fig. 3 being a sect onal elevation, Fig. 4 a bottom view, and

Fig. 5 a plan view thereof,

Fig. 6 is a sectional elevation of a third constructional form of the filter.

In Fi 1, 1 is the dust-container of the vacuumbrush and 2 is its machine housing. The filter consists of a suitable filter fabric 5, fixed at its top to a ring 4 preferably provided with a rubber coating 3 and clamped between the parts 1 and 2 or fixed to the dust-container 1 in another manner. At its bottom the filter fabric is fixed to a suitable bottom piece consisting in the constructional form shown in the drawing of two discs 6 and 7 between which the filter fabric is clamped, the discs being pressed together by a bolt 8 or the like. The discs 6 and 7 may preferably be star-shaped as shown in Fig. 2, thus leaving a proportionally great filtering surface, whereby the folds of the filter will not collapse during the sucdfieorm easiest qgn rnaenn; DENMKIBZKL aim,

When the vacuum-brush is ass imgm aaains the maqh fn and is held inits plae efgby hefp' iojece tions -1' oft h usin ie- 'O mus the;v r g Q-may aheh v a di'a i bb i r p nd inner .di'a fi 'er ett e rin 4; so 1 as to .be :held in its"v place by the latter iii H ereby thegfilter.,isfsupportd iby, y, the. stays 9,;and the; bottorn'piecer so" that "it cannot. collapse by ,t-he suctionfl Whenith filter is to be cleansed and the dustcoii'tainer e be empti d.theme hin 9u ng 2 s fir removed: Th fi'r n 1 1 1 11 W fbe whe ebyt e tay efi andv e b tto h i 6; :7. co e a ng t rew h, tha th lte is t nedinside 0 the .s fih i a are g k pt.;.closej.t g he dua oname I Wh n. t e dust; i '1 the e e lakenlf fr m th i i may be removed tro hith d t n ner, hl x all w ng 1 latt f emp e I. i

,;Inste ad of ring 10 "other. supporting means m y be a-P aye lt stay a e. g; a: cross head, a, cross, was, orfthe like. Inthe constructional. form fs h ow n in; Figs. 35 a cross head is employed and there is only one stay bolt 9 placed in the centre line of the filter. The bottom piece 6, 7 here has the shape of a star with eight rays, the discs of which are tightened together by a nut on the end of the stay 9 passing through the discs.

According to Fig. 6 the stays are fixed to a disc 10 the edge of which is bent and lies close to the supporting ring 4 so as to be held in its place by the latter. The disc 10 is provided with recesses 10 for the passage of the suction air. The filter here has the shape of a cone, the top of which is bent in and fixed to the centre of the disc 10*. The filter is stretched by a ring 12 fixed to the lower end of the stays 9, the upper end of which is fixed to the disc 10*. Instead of single stays fixed to a ring a complete cylinder may be employed for supporting the filter. This constructional form affords a very large filtering surface. The disk 10 is not'supported by the machine housing, but

is secured to the ring 4 by a bayonet lock joint 13 or similar connection'capable of disengagement.

Besides the constructional forms specified hereinbefore and shown in the drawing the filter may be greatly varied without leaving the principle of the invention.

I claim:

1. A filter for vacuum brushes of the kind wherein the filter extends into a dust container and filters dust ed on its outer surface, comprising, a dust container, a filter within, and'connected to the dust container, and means for turning the filter inside out without wholly removing it from the dust container whereby to permit dust being shaken oil the filter and into the container without raising any dust into the air.

2. A filter for vacuum brushes of the kind wherein thegfilter extends into a dust container and filters dust ofi on its outer surface, comprising, a dust container, :1 filter within the dust container, and means for turning the filter inside out without wholly removing it from the dust container whereby to permit dust being shaken off the filter and into the container without raising any dust into the air.

3. A filter for vacuum brushes of the kind wherein the filter extends into a dust container and filters dust off on its outer surface, comprising, a dust container, a filter within the dust container, and means for turning the filter inside out without wholly removing it from thedust container whereby to permit dust being shaken ofi the filter and into the container without raising any dust into the air, an operating ring, a perforated stretcher plate at the top edge of the filter,

stays connecting the bottom of the filter to.

the stretcher plate, whereby the filter is kept stretched during operation of the vacuum brush, the said means for turning including the ring which is raised from the dust container.

4. A filter for vacuum brushes of the kind wherein the filter extends into a dust container and filters dust off on its outer surface, comprising, a dust container, a filter within the dust container, and means for turning the filter inside out without wholly removing it from the dust container whereby to permit dust being shaken off the filter and into the container without raising any dust into the air, an operating ring, a perforated stretcher plate at the top edge of the filter, stays connecting the bottom of the filter to the stretcher plate, whereby the filter is kept stretched during operation of the vacuum brush, the said means for turning including the ring which is raised from the dust container and means for holding the operating ring in position, including, a filter supporting ring outside of the operating ring, and

an annular projecting machine houslng shoulder inside of the operating ring.

5. A filter for vacuum brushes of the kind wherein the filter extends into a dust container and filters dust ofi on its outer surface, comprising, a dust container, a filter within the dust container, and means for turning the filter inside out without wholly removing it from the dust container whereby to permit dust being shaken oil the filter and into the container without raising any dust into the air, an operating ring at the top edge of the filter, stays connecting the bottom of the filter to the operating ring, whereby the filter is kept stretched during operation of the vacuum brush, the said means for turning including the ring which is raised from the dust container.

In testimony whereof I afiix my signature.

PEDER ANDERSEN FISKER. 

